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	セルロース結晶性	木の収縮
分野	林学	林学
系統	Process / pipeline	Process / pipeline
提唱年	1959	1950
提唱者	Leonard Segal	Carl Skaar
種類	structural analysis	moisture response test
原典	Segal, L., Creely, J. J., Martin, A. E., & Conrad, C. M. (1959). An empirical method for estimating the degree of crystallinity of native cellulose using the X-ray diffractometer. Textile Research Journal, 29(10), 786–794.	ASTM D143-19. (2019). Standard test methods for small clear specimens of timber. ASTM International.
別名	cellulose structure, crystalline index	dimensional change, anisotropic shrinkage
関連	3	2
概要	Cellulose crystallinity refers to the degree of structural order in cellulose molecules: highly crystalline cellulose has organized, tightly packed chains; amorphous cellulose has disordered chains. Measured using X-ray diffraction, cellulose crystallinity influences wood strength, stiffness, and digestibility in pulping and enzymatic processes. Higher crystallinity correlates with greater strength and lower chemical reactivity.	Wood shrinkage is the dimensional change that occurs as wood loses moisture from green (freshly felled) to oven-dry condition. Wood shrinks anisotropically: tangentially (along growth rings) more than radially (from center to edge), and both more than longitudinally (along the grain). Measuring shrinkage percentages is essential for understanding wood drying behavior, predicting checking and warping, and selecting materials for applications sensitive to dimensional change (flooring, cabinetry, musical instruments).